"Greg Malivuk" <gma### [at] umichedu> wrote in message 
news:413151dc$1@news.povray.org...
> mapping a checkered bitmap onto the torus.  What I want to be able to do 
> is
> map an entirely different texture onto white squares than onto black
> squares.

uv_mapping, or warp, of a texture checker pattern...


torus { 1, 0.5
    texture {
     uv_mapping  // or use warp{} below, not both
      checker
      texture {
       pigment {
        granite
        color_map {
         [0 color rgb <1,0,0>]
         [1 color rgb <1,1,0>]
        }
       }
      }
      ,
      texture {
       pigment {
        bozo turbulence 0.5
        color_map {
         [0 color rgb <0,1,1>]
         [1 color rgb <0,0,1>]
        }
       }
      }
      scale <0.025,0.075,0.075>*2
     // warp {toroidal orientation y major_radius 1}
     }
}

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